A total synthesis of the triquinane sesquiterpene (±)-pentalenene(1) found in Streptomyces, based on transannular cyclisation of the bicyclo [6.3.0] undecadiene (7) in the presence of boron trifluoride etherate is described. The bicyclo(6.3.0]undecadiene(7) was elaborated from the silyl enol ether(36) using a unique intramolecular [2+2] photocycloaddition - Grob fragmentation sequence leading to (8)
基于在
三氟化硼醚化物存在下双环[6.3.0]十一碳二烯(7)的环状环化,描述了在链霉菌中发现的三喹烷
倍半萜烯(±)-
戊烯(1)的总合成。使用独特的分子内[2 + 2]光环加成反应,从甲
硅烷基烯醇醚(36)合成了双环(6.3.0)十一碳二烯(7)-Grob片段序列导致(8)[viz(36)→(37)和(38)→(8)],然后在三
水合三
水合
铑的存在下进行烯化为(40)和异构化。